{"id":"CVE-2026-46420","aliases":["GHSA-pqwm-q9pv-ph8r"],"url":"https://o3.security/vulnerability/CVE-2026-46420","summary":"setup-php: Command Injection in Repository-Derived PHP Version Resolution","details":"setup-php is a GitHub action to set up PHP with extensions, php.ini configuration, coverage drivers, and tools. From 2.25.0 prior to 2.37.1, shivammathur/setup-php resolves the PHP version from repository-controlled files such as .php-version, composer.lock through platform-overrides.php, and composer.json through config.platform.php, and insufficiently constrains those values before incorporating them into generated shell or PowerShell setup scripts, allowing command injection on a GitHub Actions runner when workflows such as pull_request_target check out attacker-controlled contents before invoking setup-php. This issue is fixed in version 2.37.1.","published":"2026-07-17T19:51:10.253Z","modified":"2026-08-12T03:51:25.136384023Z","cvss":{"score":5.6,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L"},"epss":{"score":0.01149,"percentile":0.64145,"asOf":"2026-08-15"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"GitHub Actions","name":"shivammathur/setup-php","fixedVersion":"2.37.1"}],"fix":{"url":"https://github.com/shivammathur/setup-php/commit/eeef37e059fb5368a5bc8ed8ce45ff54bd39b80b","label":"shivammathur/setup-php@eeef37e"},"references":[{"type":"WEB","url":"https://github.com/shivammathur/setup-php/releases/tag/2.37.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46420.json"},{"type":"ADVISORY","url":"https://github.com/shivammathur/setup-php/security/advisories/GHSA-pqwm-q9pv-ph8r"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46420"},{"type":"FIX","url":"https://github.com/shivammathur/setup-php/commit/eeef37e059fb5368a5bc8ed8ce45ff54bd39b80b"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:25.136384023Z"}}